AVTM24-1J REV A April 2006
37
2.0
100 Ampere System
Section A
INTRODUCTION
The Catalog No. 247100 DLRO instrument is a digital low
resistance ohmmeter designed specifically to measure very
low resistance (zero to 600 micro-ohms) with a test current
of 100 amperes. This capability is required by some
standard methods of testing large switchgear. The Catalog
No. 247100 DLR0 meets the requirements of such
standards. Relevant extracts from two such standards are:
ANSI C37.09-1999
Test Procedure for AC High Voltage Circuit Breakers
“09.5.14 Electrical Resistance of Current Path Test.
The dc resistance of the current-carrying Circuit from
terminal to terminal of each pole unit in the close
position shall be measured with at least 100 amperes
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